fix Table Index offset

[Bluesy1]

See attached traceback for context:

$ pbs-cli checkq ./instructor_stats_bank/source/unsorted/openstax_C8_Q101/openstax_C8_Q101.md
Processing question: instructor_stats_bank/source/unsorted/openstax_C8_Q101/openstax_C8_Q101.md
There is an error in this problem: 
        - File path: instructor_stats_bank/source/unsorted/openstax_C8_Q101/openstax_C8_Q101.md
        - Error: Error in running the server code, please review the below traceback: 

Traceback (most recent call last):
  File "/home/gavin/OPB/problem_bank_scripts/src/problem_bank_scripts/problem_bank_scripts.py", line 1398, in process_question_pl
    server["generate"](data2)
  File "/tmp/tmpyujhwt5s_openstax_C8_Q101/server.py", line 22, in generate
    data2["params"]["table1"] = pbh.create_html_table(table2, width="550px", first_row_is_header=True, first_col_is_header=False,)
                                                      ^^^^^^
NameError: name 'table2' is not defined. Did you mean: 'table1'?